These may prove useful for learning more: http://www.afip.org/ferrets/SCC/SCC.html http://fhl.sonic-weasel.org/browse.php?msg=YG3571 http://fhl.sonic-weasel.org/browse.php?msg=SG276 Unless things have changed it looks like excision is the only real option. Unless things have changed radically (and I don't think that they have though I know that one manufacturer was said by a third party to considering some tests) it is NOT known how long past one year that distemper vax of any currently used type remain effective for ferrets. (This can NOT be accurately or safely generalized from other species since ferrets have already turned out to differ in this regard in relation to other vax.) I do know that at least one of the vax is not effective for that long because of a failure to provide sufficient protection which occurred around here in one household. [Posted in FML issue 5016]